Who doesn't LOVE to design baby stuff? Announcements, invitations, personalized gallery wraps, art prints, thank you cards, party ware... there are so many opportunities to wrap yourself in babyness and help a mother-to-be celebrate the impending center of her universe. 
Here's a fun pinterest board that will suck up your time and make you want to have a(nother?) baby. Or maybe it will inspire you to design more baby stuff to offer. It's also full of fun ideas for designed paper products.
This design, by my sidekick at Simon+Kabuki, has the potential to sell for many thousands of dollars based on our past experience. Baby related stationery has been our best source of income for all the years we've been in the business. And it doesn't only happen for a couple of months of the year, it's a constant revenue stream.
First birthdays have become huge celebrations for many families and a new mom who loves your style will go back to you for her big life events for years to come. Don't forget to design matching thank you notes for each announcement or invitation in your collection, you're making it easy for a busy mom/mom-to-be.